Police have released a photo of someone they want to speak to after a man was punched unconscious on a train travelling through London Bridge.
Officers believe the man pictured in the CCTV image may have information that could assist their investigation.
At around 2.40pm, on Saturday, June 24, the victim, who was with his friends, boarded a train travelling from Blackfriars to Brighton.
He then sat next to a stranger. British Transport Police (BTP) say the stranger became verbally aggressive before punching the victim in the head.
The alleged assailant then disembarked at London Bridge station.
The victim lost consciousness and suffered bruising and a perforated eardrum as a result of the incident.
Those who recognise the man pictured, or have any information, are asked to contact BTP by texting 61016 or calling 0800 40 50 40 quoting reference 370 of 24/06/2023. Alternatively, people can call Crimestoppers anonymously on 0800 555 111.